The Department of Homeland Security has release a National Terrorism Advisory System (NTAS) Bulletin.
A NTAS ‘Bulletin’ describes current developments or general trends regarding threats of terrorism.
Summary:
  • Iran has been designated a “State Sponsor of Terrorism” since 1984.
  • Iran’s Revolutionary Guards were designated a “Foreign Terrorist Organization” in 2019.
  • On January 02, the US carried out a lethal strike against the Revolutionary Guard’s Commander.
  • Iranian leadership and affiliated violent extremist organizations have stated they intended to retaliate.
NOTE: At this time there is no information indicating a specific, credible threat to the Homeland.

The full Bulletin is here and contains additional information.
“If You See Something, Say Something”. Report suspicious activity to local law enforcement or call 911.